Generation of document classifiers

ABSTRACT

A method includes receiving, via a graphical user interface including a plurality of document elements and a plurality of class elements, user input associating a first document element of the plurality of document elements with a first class element of the plurality of class elements. Each document element represents a corresponding document of a plurality of documents, and each class element represents a corresponding class of a plurality of classes. The method also includes generating a document classifier using supervised training data, where the supervised training data indicates, based on the user input, that a first document represented by the first document element is assigned to a first class associated with the first class element.

BACKGROUND

A document classifier is a data model that is used to evaluate documents and assign the documents to one or more categories. The document classifier may be binary, in which case the document classifier assigns each document to one of two categories, generally of the form “A” and “not A”. For example, a binary document classifier may assign documents to categories such as “fiction” or “non-fiction.” Alternatively, a document classifier may assign documents to one or more of a larger number of categories. For example, a document classifier may sort documents into subject matter categories, such as “biography,” “mystery,” “geology,” “religion,” and so forth.

To classify a document, a document classifier generally extracts features from the document, such as information indicating whether a particular word appears in the document or a frequency of appearance of the particular word in the document. Because of the large differences between different data sets and different features that can be extracted from the different data sets, document classifiers are typically custom built by data scientists for a particular data set. For example, a data scientists may be employed to identify relevant distinguishing features within a data set, select an appropriate type of data model to classify documents based on the relevant distinguishing features, and build and test the document classifier.

Employing a data scientist to generate a document classifier can be expensive. Additionally, as new classes of documents are added, the document classifier built by the data scientist can become out of date and cease to function reliably, which may entail hiring the data scientist again to update or entirely rework the document classifier. Further, many business and government entities that could benefit from the use of a document classifier maintain records that they consider to be sensitive. For example, medical entities, banking entities, and government entities may each maintain large document collections that include many confidential or access restricted documents. Such entities may be reluctant to (or unable to) give a data scientist access to these sensitive records to build a document classifier.

SUMMARY

Particular implementations of systems and methods to simplify generating and managing (e.g., versioning) document classifiers are described herein. A particular system uses a simple and intuitive graphical user interface (GUI) to enable a user to define classes (e.g., document classes) and to assign documents to the classes. Data generated based on document-class assignments provided via the GUI are used as a supervised training data set to build a document classifier, as describe further below. The GUI is visually similar to a traditional representation of a file system interface. For example, in the GUI, classes may be represented by folder icons, or similar graphical representations. As another example, if the classes include sub-classes in a hierarchical arrangement, the relationships among classes may be graphically represented using a folder-in-folder arrangement or folder tree.

The GUI may also mimic file system operations to add classes, to delete classes, or to re-arrange relationships among classes. For example, a new class can be added by adding (e.g., using a “new folder” menu option) a new folder corresponding to the new class to the GUI. Similarly, a class can be deleted by deleting (e.g., using a “delete folder” menu option) a folder corresponding to the class from the GUI. Classes can be re-arranged in the hierarchy using drag-and-drop, move, cut-paste, or copy-paste operations to rearrange folders in the GUI that represent the classes. Thus, users who are able to navigate a relatively simple file system interface are able to define classes for a document classifier.

Further, the GUI may mimic file system operations to manage assignment of documents to particular classes to generate the supervised training data. For example, a user (or multiple users) can assign a document to a class using operations that mimic drag-and-drop, move, cut-paste, or copy-paste operations. To illustrate, the GUI may display a graphical representation of a document (e.g., a thumbnail or icon), and the user may drag the icon to a folder representing a particular class to assign the document to the particular class. If a document is associated with two or more classes, the representation of the document can be dragged and dropped in two or more folders corresponding to the classes.

By representing the classes and documents in a file system-like GUI, the system simplifies user interactions so that extensive model building training or data scientists are not needed to build reliable supervised training data. Further, because classifying documents manually may best be performed by users who are familiar with the documents (e.g., how the documents are used and why the documents were generated), improved document classification may result from enabling users who generate and use the documents to assign document classifications. For similar reasons, using the file system-like GUI also simplifies verifying and updating a document classifier, as described further below.

In a particular aspect, a computing device includes a memory storing document classifier generation instructions and a processor configured to execute instructions from the memory. The document classifier generation instructions are executable by the processor to perform operations including receiving, via a graphical user interface including a plurality of document elements and a plurality of class elements, user input associating a first document element of the plurality of document elements with a first class element of the plurality of class elements. Each document element represents a corresponding document of a plurality of documents, and each class element represents a corresponding class of a plurality of classes. The operations also include generating a document classifier using supervised training data, where the supervised training data indicates, based on the user input, that a first document represented by the first document element is assigned to a first class associated with the first class element.

In another particular aspect, a method includes receiving, via a graphical user interface including a plurality of document elements and a plurality of class elements, user input associating a first document element of the plurality of document elements with a first class element of the plurality of class elements. Each document element represents a corresponding document of a plurality of documents, and each class element represents a corresponding class of a plurality of classes. The method also includes generating a document classifier using supervised training data, where the supervised training data indicates, based on the user input, that a first document represented by the first document element is assigned to a first class associated with the first class element.

In another particular aspect, a computer readable storage device storing instructions that are executable by a processor to perform operations including receiving, via a graphical user interface including a plurality of document elements and a plurality of class elements, user input associating a first document element of the plurality of document elements with a first class element of the plurality of class elements. Each document element represents a corresponding document of a plurality of documents, and each class element represents a corresponding class of a plurality of classes. The operations also include generating a document classifier using supervised training data, where the supervised training data indicates, based on the user input, that a first document represented by the first document element is assigned to a first class associated with the first class element.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 illustrates a particular example of a system that is operable to generate a document classifier;

FIG. 2 illustrates a first particular example of a graphical user interface to simplify document classifier generation;

FIG. 3 illustrates a second particular example of a graphical user interface to simplify document classifier generation;

FIG. 4 illustrates a third particular example of a graphical user interface to simplify document classifier generation;

FIG. 5 illustrates a fourth particular example of a graphical user interface to simplify document classifier generation;

FIG. 6 illustrates a fifth particular example of a graphical user interface to simplify document classifier generation;

FIG. 7 illustrates a process for generating a document classifier based on user input;

FIG. 8 illustrates details of particular aspects of the process for generating a document classifier based on user input of FIG. 7;

FIG. 9 is a flowchart illustrating a particular example of a method of generating a document classifier based on user input; and

FIG. 10 is a flowchart illustrating another particular example of a method of generating a document classifier based on user input.

DETAILED DESCRIPTION

FIG. 1 illustrates a particular example of a system 100 that is operable to generate a document classifier. The system 100 includes a display device 101 coupled to a computing device 102. The computing device includes a processor 103 and a memory 104 accessible to the processor 103. The processor 103 is configured to execute instructions from the memory 104 to perform various operations described herein, such as operations to generate a document classifier. For example, as explained further below, the system 100 is configured to use an intuitive graphical user interface (GUI) 130 to enable a user to define classes (e.g., document classes) and to assign documents to the classes. The documents assigned to the classes may be used to generate a supervised training data set to build a document classifier.

In the example illustrated in FIG. 1, the memory 104 stores classifier generation instructions 106 and document management instructions 107. The memory 104 may also store one or more other applications 105, such as a file system browser, an internet browser, document generation applications (e.g., a word processor), etc. The memory 104 may also store one or more files 109. For example, the files 109 may include or correspond to at least some of the documents to be classified using a document classifier. In other examples, the files 109 including documents to be classified using a document classifier may be stored at a different memory (not shown) within the computing device 102 or remote from the computing device 102 (e.g., in a remote data store).

The memory 104 may also include file tables 108. The file tables 108 include information to enable navigation though a file system to access the files 109. For example, the file tables 108 may include information such as identifiers of the files 109, data indicating physical storage locations of the files 109, metadata associated with the files 109, an arrangement of folders or other logical storage locations of the file system, etc. The specific content and arrangement of the file tables 108 depends on the file system used to store the files 109.

The classifier generation instructions 106 include GUI generation instructions 112 that are executable by the processor 103 to generate the GUI 130. In the example illustrated in FIG. 1, the GUI 130 includes a document classification portion 131 and a file system navigation portion 132.

The file system navigation portion 132 includes a graphical representation of a portion of the file system. For example, in FIG. 1, the file system navigation portion 132 includes a drive icon 133 identifying a particular storage device for which information is presented. In some implementations, the file system navigation portion 132 may include information for multiple storage devices, including local drives, network drives, networked databases, cloud-storage resources, and internet-based resources. The file system navigation portion 132 also includes folder icons 134, 135 arranged according to a hierarchy of logical storage locations (e.g., folders) associated with the storage device. The file system navigation portion 132 also includes document icons 136-138 representing documents. In FIG. 1, a folder icon 135 is illustrated as “open” indicating that the document icons 136, 137, 138 represent documents in the file system that are associated with a storage location represented by the folder icon 135.

The document classification portion 131 includes a file system like representation of user-defined document classes. For example, each user-defined document class of a new classifier 140 is represented in FIG. 1 by a class element depicted as a folder icon. Thus, a folder icon 141 is a class element representing a class entitled “Class 1”, and a folder icon 142 is a class element representing a class entitled “Class 2”.

In the particular example illustrated in FIG. 1, one or more of the user-defined classes include sub-classes. The document classification portion 131 represents a relationship among classes and sub-classes using a folder-in-folder scheme. For example, in FIG. 1, the class Class 2 includes several sub-classes entitled “Class 2.1” and “Class 2.2”, respectively. The classes Class 2.1 and Class 2.2 are identified as sub-classes of the class Class 2 by the open folder icon 142 representing the class Class 2, indentation of the folder icons 143 and 144 representing the classes Class 2.1 and Class 2.2 under the folder icon 142 representing the class Class 2, lines connecting the folder icons 143 and 144 representing the classes Class 2.1 and Class 2.2 to the folder icon 142 representing the class Class 2, and an arrow element 145 adjacent to the folder icon 142 representing contents of the class Class 2. In other example, the document classification portion 131 may include other visual prompts to indicate a hierarchical arrangement of classes and sub-classes.

The file system like representation associated with the document classification portion 131 makes generation of a document classifier highly intuitive for users who regularly work with computers, but who may not regularly perform data science activities, such as generating a document classifier. To illustrate, the GUI 130 may be configured to mimic file system operations to add classes, to delete classes, or to re-arrange relationships among classes. For example, a new class can be added to the new classifier 140 by adding (e.g., using a “new folder” menu option) a new folder corresponding to the new class to the document classification portion 131 of the GUI 130. Similarly, a class can be deleted from the new classifier 140 by deleting (e.g., using a “delete folder” menu option) a folder icon corresponding to the class from the GUI 130. Classes can be re-arranged in the hierarchy by using drag-and-drop, move, cut-paste, or copy-paste operations to rearrange folders icons in the GUI 130. Thus, users who are able to navigate a relatively simple file system interface are able to define classes for the new classifier 140.

The GUI 130 also mimics file system operations to manage assignment of documents to particular classes. For example, a user (or multiple users) can assign a document to a class using operations that mimic drag-and-drop, move, cut-paste, or copy-paste operations. To illustrate, in FIG. 1, the file system navigator portion 132 of the GUI 130 displays the document icons 136, 137, 138 representing document Doc 1, Doc 2, and Doc 3, respectively. To assign a document to a particular class, a user may use a pointer 146 to select the document icon representing the document and drag the document icon to a folder representing a particular class. For example, in FIG. 1, the pointer 146 is illustrated selecting the document icon 137 representing the document Doc 2 and dragging the document icon 137 to the folder icon 144 associated with the class Class 2.2. The drag-and-drop operation in this example causes data to be stored indicating that the document Doc 2 is assigned to the class Class 2.2. If a document is associated with two or more classes, the document icon representing the document can be placed in two or more folder icons corresponding to the classes.

User input received via the GUI 130 and indicating assignment of a document to a class is used by the computing device 102 to generate classification data 117. For example, the user input is communicated, as input data 150, to the processor 103. The processor 103, executing the classifier generation instructions 106, stores information describing the document-class assignments in the classification data 117. In a particular aspect, the classifier generation instructions 106 are configured such that input received via the GUI 130 is not used to change the file tables 108. For example, assigning the document Doc 2 to the class Class 2.2 by dragging the document icon 137 to the folder icon 144 does not affect a logical or physical storage location associated with the document Doc 2 in the file system. Rather, in response to dragging the document icon 137 to the folder icon 144, the classifier generation instructions 106 generate an entry in the classification data 117. The entry includes a pointer to a storage location of the document Doc 2 and a tag (or label) indicating that the document Doc 2 is assigned to the class Class 2.2.

Entries in the classification data 117 may also include information indicating whether the entries were generated based on manual or automatic classifications. For example, a first entry 118 of the classification data 117 of FIG. 1 includes a pointer-tag combination and an M indicating that the first entry 118 is based on a manual document classification, such as by a user dragging the document icon 137 to the folder icon 144. Other entries of the classification data 117 may indicate that they were created based on automatic classifications. For example, a second entry 119 of the classification data 117 of FIG. 1 includes a pointer-tag combination and a “v.1” indicating that the second entry 119 is based on an automatic classification from a first version (version “v.1”) of a document classifier. Similarly, a third entry 120 of the classification data 117 of FIG. 1 includes a pointer-tag combination and a “v.2” indicating that the third entry 120 is based on an automatic classification from a second version (version “v.2”) of the document classifier.

Defining the classes and assigning documents to classes may be performed concurrently or sequentially. For example, a user may define a set of classes into which a corpus of documents are to be assigned. Subsequently, the same user or another user (or set of users) may assign documents from the corpus of documents to the classes (e.g., by moving representations of the documents to folders representing the classes). Alternatively, a new class can be defined after some documents have been assigned to previously defined classes. For example, a user that is manually classifying documents may, upon reviewing a particular document, determine that the particular document belongs to a class that is not represented in the previously defined classes. In this example, the user may generate a new class (using a “new folder” type operation) and assign the particular document to the new class (e.g., using a drag-and-drop operation). By representing the classes and documents in the file system-like GUI 130, the system 100 simplifies user interactions so that extensive model building training or data scientists are not needed to build the classification data 117.

In FIG. 1, the classifier generation instructions 106 include feature extraction instructions 113 and machine learning instructions 121. The feature extraction instructions 113 are executable by the processor 103 to generate supervised training data, and the machine learning instructions 121 are executable by the processor 103 to automatically generate a document classifier (or a set of document classifiers) based on the supervised training data.

In the example of FIG. 1, the feature extraction instructions 113 include word list instructions 114, word vector (“wordvec”) instructions 115, and document vector (“docvec”) instructions 116. The word list instructions 114 are executable by the processor 103 to generate a word list for each document of a set of documents. For example, the word list instructions 114 may generate a word list for each document associated with a manual classification in the classification data 117. In another example, the word list instructions 114 may generate a word list for each document in a corpus of documents including documents that are not associated with a classification. To illustrate, the files 109 may correspond to or include the corpus of documents, and users may manually classify only a subset of the documents in the files 109. In this illustrative example, the word list instructions 114 may generate word lists for all of the documents in the files 109. Additionally, in some implementations, the word list instructions 114 may determine statistical information representing occurrences of the words in the corpus of documents. For example, the word list instructions 114 may determine a count of occurrence of each word in the corpus of documents, a frequency of occurrence of each word in the corpus of documents, or an inverse frequency of occurrence of each word in the corpus of documents (e.g., an inverse document frequency (IDF)).

The wordvec instructions 115 are configured to access or generate wordvecs for words in the corpus of documents. A word vector refers to a vector or other data structure that represents syntactic and semantic relationships among words in an analyzed set of documents. The analyzed set of documents may include or correspond to the documents in the files 109, or the analyzed set of documents may be independent of and distinct from the files 109. Stated another way, the wordvecs may be generated based on the corpus of documents of the files 109, or may be generated independently of the corpus of documents of the files 109. For example, when the files 109 include documents in English, the wordvecs may be generated based on analysis of a distinct data set of English language documents. In this example, the wordvecs represent syntactic and semantic relationships among English language words in general, and not of the documents in files 109 in particular. Alternatively, the wordvecs may be determined based on the documents in the files 109, or based in part on the documents in the files 109. In a particular implementation, the wordvecs are generated via analysis of the documents in the files 109 using a continuous bag of words (CBOW) process or a skip-gram process.

The docvec instructions 116 are configured to generate docvecs for documents in the corpus of documents. A docvec is a vector or other data structure that represents a set of wordvecs for words in a particular document. The docvec of a document may be determined by identifying words in the document (e.g., based on a word list generated by the word list instructions 114), determining wordvecs for the words in the document, and mathematically combining wordvecs for the words in the document to generate a docvec of the document. Thus, the docvec represents an aggregation of syntactic and semantic relationships among the words in a particular document.

In a particular implementation, the docvec for a particular document is generated by aggregating the wordvecs for the particular document using a field by field mathematical operation. For example, each wordvec includes a plurality of fields (e.g., values or data elements), and the docvec of the particular document may represent a field-by-field sum or average of the wordvecs of the words in the particular document. As another example, the docvec of the particular document may represent a field-by-field weighted sum or weighted average of the wordvecs of the words in the particular document. In this example, a weighting value applied to a wordvec for a particular word is determined based on a frequency of occurrence (or another indication of specificity) of the particular word in the corpus of documents being classified. To illustrate, the frequency of occurrence or specificity of words may be determined as an inverse document frequency (IDF) value for each word in the document corpus. In this example, the docvec for a particular document may be calculated as a sum or average of the wordvecs for the particular document, where each wordvec is weighted by the corresponding IDF value.

In a particular implementation, the documents manually classified by a user are processed to extract features, such as docvecs, which are used with classification information for each document as supervised training data input to the machine learning instructions 121. For example, the supervised training data may include a docvec for each document and a tag indicating a class to which the document is assigned.

The machine learning instructions 121 are executable by the processor 103 to perform an automated model building process to generate a document classifier based on the supervised training data. In some implementations, the machine learning instructions 121 are configured to generate multiple document classifiers (e.g., multiple preliminary document classifiers 122) based on the supervised training data. In such implementations, the multiple preliminary document classifiers 122 may be of different types, such as a neural network-based document classifier, a decision tree-based document classifier, a support vector machine-based document classifier, a regression-based document classifier, a perceptron-based document classifier, a naive Bayes-based document classifier, a document classifier using another machine learning process, or a combination thereof. In a particular aspect, each preliminary document classifier of the multiple preliminary document classifiers 122 may be generated using respective classifier generation settings 123. For example, a first preliminary document classifier may be generated using particular classifier generation settings of the classifier generation settings 123, and a second preliminary document classifier may be generated using different classifier generation settings of the classifier generation settings 123. As described further below, the classifier generation settings 123 may indicate a type of document classifier (or types of document classifiers) to be generated and parameters associated with generating the document classifier. In this example, the supervised training data are provided to the machine learning instructions 121, and the machine learning instructions 121 generate multiple document classifiers.

Some types of document classifiers may perform better (e.g., provide more reliable document classification) than other types for a particular document corpus. For example, a support vector machine (SVM) classifier may perform better than a neural network classifier for a particular document corpus, whereas a neural network classifier may perform better than a SVM classifier for another document corpus. Typically, a data scientist uses expertise and training to determine which type of classifier model to use for a particular document corpus. However, to avoid the expense of relying on the expertise of a data scientist, particular implementations described herein generate a suite of preliminary document classifiers 122 for a document corpus being classified. The suite of preliminary document classifiers 122 includes multiple distinct types of document classifiers.

The performance of each preliminary document classifier is evaluated to identify a best performing preliminary document classifier of the suite of preliminary document classifiers 122. In a particular implementation, the best performing preliminary document classifier is selected for use (e.g., as an active document classifier 110). In another implementation, after the best performing preliminary document classifier is identified, the machine learning instructions 121 generate the active document classifier 110 based on classifier generations settings that were used to generate the best performing preliminary document classifier. In this implementation, the active document classifier 110 may be generated using all of the supervised training data, or a larger subset of the supervised training data than was used to generate the best performing preliminary document classifier.

For example, to generate the preliminary document classifiers 122, the machine learning instructions 121 may partition the supervised training data into a first portion (e.g., a training portion) and a second portion (e.g., a test portion). The training portion of the supervised training data may be used to generate the preliminary document classifiers 122, and the test portion may be used to evaluate performance of the preliminary document classifiers 122. In this example, the test portion may be provided as input to each of the preliminary document classifiers 122, and performance of each of the preliminary document classifiers 122 may be evaluated based on document classifications output by each preliminary document classifier. The preliminary document classifier that provides document classification that most closely matches the user specified classifications may be identified as the best performing preliminary document classifier. To illustrate, document classifications generated by a first preliminary document classifier may be compared to manual document classifications indicated in the supervised training data to generate a first performance metric associated with the first preliminary document classifier. Likewise, document classifications generated by a second preliminary document classifier may be compared to the manual document classifications indicated in the supervised training data to generate a second performance metric associated with the second preliminary document classifier. In this illustrative example, the first performance metric and the second performance metric may be compared to determine a best performing preliminary document classifier among the multiple preliminary document classifiers 122. In some implementations, other performance metrics may also be used to determine a best performing preliminary document classifier, such as complexity of each of the preliminary document classifiers 122, a processing time of each of the preliminary document classifiers 122, and so forth.

If none of the preliminary document classifiers 122 performs adequately (e.g., with accuracy greater than or equal to a threshold established by a performance criterion), the user may be prompted to increase the size of the supervised training data, e.g., by classifying more documents. In this example, if no preliminary document classifier satisfies the performance criterion, the machine learning instructions 121 may instruct the GUI generation instructions 112 to prompt the user to provide additional document classifications to improve the accuracy or other performance metrics of the preliminary document classifiers 122. Alternatively, the machine learning instructions 121 may restart the model building process using the supervised training data to generate a new suite of preliminary document classifiers, which may be tested for performance.

In a particular aspect, the machine learning instructions 121 generate the active document classifier 110 using classifier generation settings associated with the best performing preliminary document classifier. Further, in this particular aspect, rather than partitioning the supervised training data (e.g., into a training portion and a test portion), the machine learning instructions 121 may use the entire set of supervised training data (or a larger subset of the supervised training data) to generate the active document classifier 110. For example, the classifier generation settings 123 may cause the machine learning instructions 121 to use a training portion of the supervised training data to generate a SVM-based preliminary document classifier and a neural network-based preliminary document classifier. In this example, a test portion of the supervised training data is used to test performance of the SVM-based preliminary document classifier and the neural network-based preliminary document classifier. If the SVM-based preliminary document classifier outperforms the neural network-based preliminary document classifier, the machine learning instructions 121 use the entire set of supervised training data to generate the active document classifier 110 as a SVM-based document classifier using settings (from the classifier generation settings 123) that were used to generate the SVM-based preliminary document classifier. However, if the neural network-based preliminary document classifier outperforms the SVM-based preliminary document classifier, the machine learning instructions 121 use the entire set of supervised training data to generate the active document classifier 110 as a neural network-based document classifier using settings (from the classifier generation settings 123) that were used to generate the neural network-based preliminary document classifier.

The machine learning instructions 121 may be initiated responsive to user input or automatically in response to detecting that an initiation criterion has been satisfied. For example, an initial document classifier may be built based on determining that the supervised training data is sufficient (e.g., that at least one document has been assigned to each class). As another example, the active document classifier 110 may be updated (or a new document classifier may be generated) occasionally, in which case the initiation criterion is a rebuild criterion. The rebuild criterion may be satisfied when a time limit expires or when another condition indicates that performance of the active document classifier 110 becomes suspect. To illustrate, the rebuild criterion may be satisfied when a distribution of document classifications determined by the active document classifier 110 changes significantly (e.g., more than a threshold amount).

The active document classifier 110 may be used to classify new documents as well as documents of the document corpus that were not manually classified. For example, when a new document is added to the files 109, the active document classifier 110 may classify the new document and store data indicating the classification. In a particular implementation, the data indicating the classification may be stored as a pointer and a tag in the classification data 117 as described above. In this implementation, the classification data 117 are stored separately from the documents of the document corpus. Further, classification data generated by the active document classifier 110 and manual classifications generated by the user may be stored together (in a shared data structure) or separately. Whether the classification data generated by the active document classifier 110 and the manual classifications generated by the user are stored together or separately, the classification data generated by the active document classifier 110 and the manual classifications generated by the user may be distinguishable. For example, classification data generated by the active document classifier 110 may be flagged or tagged as automatically generated, and manual classifications generated by the user may be flagged or tagged as manually generated. To illustrate, an entry of the classification data 117 generated by the active document classifier 110 may be stored with data identifying a particular document classifier that generated the data (e.g., a version number or other identifier, such as the version number “v.1” of the second entry 119 of the classification data 117). As another illustrative example, an entry of the classification data 117 generated based on a manual classification by a user may be tagged or labeled with an identifier of the user (e.g., a user name or other identifier).

Storing data distinguishing automatically generated classifications from user generated classifications enables use of the user generated classifications as supervised training data during generation of a subsequent document classifier. For example, while a first active document classifier is in use, a user may notice that a particular document has been misclassified by the first active document classifier. The user may reclassify the particular document (e.g., by dragging an icon representing the document from a folder representing a first class to a folder representing a second class). Based on the user's reclassification of the particular document, data identifying the new classification of the particular document and data identifying the user may be stored in the classification data 117. Subsequently, the new classification of the particular document may be used as part of the supervised training data to generate a new document classifier based on the new classification being identified as user generated. Thus, user generated classifications indicated during a training session (e.g., when the user is classifying documents but not using or generating the document) can be used with classifications indicated while a user is using or generating the document to generate a new or updated document classifier.

In a particular implementation, the classifier generation instructions 106 may store data indicating automatic document classifications over time. For example, a count may be incremented (or a corresponding data entry updated) when the active document classifier 110 assigns a document to a particular class. Over time, document classification trends associated with the active document classifier 110 may become apparent and may be used as an indicator of when the reliability of the active document classifier 110 is suspect. For example, during a first period of time, documents classified by the active document classifier 110 may have a first distribution among the classes. Subsequently, during a second period of time, documents classified by the active document classifier 110 may have a second distribution among the classes, where the second distribution differs significantly (e.g., more than a threshold difference) from the first distribution. Such a change in the distribution of documents among various classes may indicate that the document corpus has changed (e.g., through addition of new documents) enough that a new document classifier should be generated. Generation of the new (or updated) document classifier may be performed automatically based on determining that the reliability of the active document classifier 110 is suspect, or a user or system administrator may be prompted to initiate generation of the new (or updated) document classifier based on determining that the reliability of the active document classifier 110 is suspect. Generation of a new (or updated) document classifier proceeds as described above with all user generated classifications and reclassification being used as supervised training data.

Generation of a new (or updated) document classifier may also, or in the alternative, be performed based on user reclassification of documents that the active document classifier 110 classified. For example, a count or other indication of user reclassification of documents may be maintained. When the count exceeds a threshold (or when a rate of reclassifications exceeds a threshold rate), generation of a new (or updated) document classifier may be performed with all user generated classifications and reclassification being used as supervised training data. Further, a new (or updated) document classifier may be generated based on a user modifying the classes. For example, after a period of using the active document classifier 110, a user may recognize that two distinct types of documents are being grouped together in a single class. Accordingly, the user may generate a new class (or two new classes) and assign documents to the new class or new classes using the file system-type operations described above. The original class that included the two distinct types of documents may be retained or deleted. As another example, after a period of using the active document classifier 110, a user may generate a new type of document and assign the new type of document to a new class, e.g., by using the file system-type operations described above. After the classes have been modified (e.g., by adding new classes, deleting old classes, rearranging the hierarchy of a classes, etc.), generation of a new (or updated) document classifier may be initiated. Thus, the file system-type operations describe above enable simplified, low-cost creation and maintenance of document classifiers.

In the example illustrated in FIG. 1, the memory 104 includes document management instructions 107. The document management instructions 107 may be executable by the processor 103 to perform operations that facilitate document management after a document classifier has been generated by the classifier generation instructions 106. For example, in FIG. 1, the document management instructions 107 include the active document classifier 110 and document access instructions 111. The active document classifier 110 may be configured to provide document classifications for documents that were not manually classified. For example, when a new document is generated or imported into the files 109, the active document classifier 110 may assign the document to one or more of the classes.

The document access instructions 111 are executable by the processor 103 to enable class-based access to the documents. For example, the document access instructions 111 may include a file browser application that enables users to view the classes via a GUI and to access documents via the GUI. In another example, the document access instructions 111 may include a plug-in or other supplemental instructions that enable a file system browser to display graphical representations of the classes and enable access to the documents via the classes. Since the document classifications are independent of storage locations within the file system, the document access instructions 111 may use the pointers and tags in entries of the classification data 117 to enable class-based access to the documents.

Although FIG. 1 illustrates a single computing device 102, in other implementations, the system 100 may include more than one computing device. For example, a first computing device (e.g., the computing device 102 of FIG. 1) may generate the active document classifier 110 and distribute copies of the active document classifier 110 to multiple other computing devices via a network. As another example, the classifier generation instructions 106 may be distributed among multiple computing devices such that the multiple computing devices cooperate to generate the active document classifier 110. To illustrate, a first preliminary document classifier of the preliminary document classifiers 122 may be generated by a first computing device, and a second preliminary document classifier of the preliminary document classifiers 122 may be generated by a second computing device. In this illustrative example, the first and second preliminary document classifiers may be sent to one or more other computing devices for performance testing, or the computing device that generated a particular preliminary document classifier may test the particular preliminary document classifier and report performance test results to another computing device for selection of the best performing document classifier. Further, the document access instructions 111 may be distributed among multiple computing devices to enable users of the multiple computing devices to browse files or documents based on the classification data 117. Moreover, the files 109 may be stored at many different computing devices that are connected via a network. Thus, the system 100 may be operable as an enterprise-based or internet-based document analysis and classification system that generates and manages document classifiers without oversight by a data scientist.

FIGS. 2-6 illustrate examples of the graphical user interface 130. In the examples illustrated in FIGS. 2-6, the GUI 130 includes selectable options to perform the file system-type operations described with reference to FIG. 1. For example, the GUI 130 includes selectable options to manage classes, selectable options to access particular portions of the files system, and selectable options to initiate or manage generation of document classifiers. For ease of illustration and to mimic familiar user interfaces, these selectable options may be functionally grouped using tabs. Thus, in FIGS. 2-6, the GUI 130 includes a classifier tab 201, a file system tab 202, and a builder tab 203. In other examples, the selectable options may be organized in a different manner (with or without tabs). For example, icons representing various selectable options may be arranged in a “ribbon” or tool bar in the GUI 130. As another example, the selectable options may be accessible via context menus, as described further below.

FIG. 2 represents the GUI 130 with the classifier tab 201 selected. The classifier tab 201 may include selectable options associated with defining classes and assigning documents to classes. For example, in FIG. 2, the classifier tab 201 includes a tool bar that includes selectable options 210-216. The selectable options 210-216 include a new folder selectable option 210 to generate a new folder in the document classification portion 131 of the GUI 130. The new folder generated by selection of the new folder selectable option 210 represents a new class; thus, selecting the new folder selectable option 210 causes a new class to be generated and a graphical representation of the new class (in the form of a folder icon) to be displayed in the GUI 130.

The selectable options 210-216 also include a rename folder selectable option 211 to rename a folder in the document classification portion 131 of the GUI 130. Selecting a folder in the document classification portion 131 of the GUI 130 and selecting the rename folder selectable option 211 enables the user to assign a new name to a class (represented by the selected folder).

The selectable options 210-216 also include a delete folder selectable option 212 to delete a folder in the document classification portion 131 of the GUI 130. Selecting a folder in the document classification portion 131 of the GUI 130 and selecting the delete folder selectable option 212 causes a class represented by the selected folder to be deleted.

The selectable options 210-216 also include a move to selectable option 213. Selection of the move to selectable option 213 enables a user to move a document or folder in the GUI 130. Functionality of the move to selectable option 213 may depend on whether a folder is selected in the document classification portion 131 of the GUI 130 or a document is selected in the file system navigator portion 132 of the GUI. For example, when a user selects a folder in the document classification portion 131 of the GUI 130 and selects the move to selectable option 213, the selected folder may be moved within a hierarchy of the new classifier 140. To illustrate, after the user selects the folder icon 144 and selects the move to selectable option 213, the user may move the folder icon 144 into the folder icon 141. In this illustrative example, moving the folder icon 144 into the folder icon 141 causes the class Class 2.2 to be a sub-class of the class Class 1 rather than a sub-class of the class Class 2. If the user selects a document in the file system navigation portion 132 of the GUI 130 and selects the move to selectable option 213, the selected document may be moved to a folder of the new classifier 140. To illustrate, if the user selects the document icon 136 and selects the move to selectable option 213, the user may move the document icon 136 into the folder icon 144. In this illustrative example, moving the document icon 136 into the folder icon 144 causes the document Doc 1 to be assigned to the class Class 2.2.

The selectable options 210-216 also include a copy selectable option 214, a cut selectable option 215, and a paste selectable option 216. The copy selectable option 214, the cut selectable option 215, and the paste selectable option 216 perform copy, cut, and paste operations, respectively, on selected icons of the GUI 130. As explained above, the icons represent documents and classes. Accordingly, copying, cutting, or pasting operations performed on folder icons change classes of the new classifier 140. For example, copying and pasting the folder icon 144 into the folder icon 141 causes a new sub-class, with the name class Class 2.2, to be added as a sub-class of the class Class 1 while retaining the class Class 2.2 as a sub-class of the class Class 2. Copying, cutting, or pasting operations performed on a document icon changes assignment of the document represented by the document icon to one or more classes of the new classifier 140. For example, copying and pasting the document icon 136 into the folder icon 144 causes the document Doc 1 to be assigned to the class Class 2.2.

Various operations may also, or in the alternative, be performed using context menu selections. For example, a context menu 221 may be displayed in response to a user using the pointer 146 to select (e.g., to “right click”) the document icon 136. In this example, the context menu 221 includes selectable options similar to one or more of the selectable options 210-216. The context menu 221 may also include other selectable options or information. For example, in FIG. 2, the context menu 221 includes a description of the document Doc 1. The description may include metadata, such as a timestamp, a file name, a file name extension, information regarding who generated the document, etc. If the selected document has been assigned to a class, the context menu 221 may indicate which class or classes the document has been assigned to, information indicating how the assignment was generated (e.g., manually or automatically), etc.

FIG. 3 illustrates an example of a context menu 301 displayed responsive to selection (e.g., a right-click) of a folder icon. In this example, the context menu 301 includes selectable options similar to one or more of the selectable options 210-216. The context menu 301 may also include other selectable options or information, such as a description of the class Class 2.1 associated with the selected folder icon.

FIG. 4 illustrates an example of a context menu 401 displayed responsive to selection (e.g., a right-click) of a root folder icon representing the new classifier 140. In this example, the context menu 401 includes selectable options similar to one or more of the selectable options 210-216. The context menu 401 may also include a selectable option (e.g., a “build classifier” option) to initiate generations of a document classifier. In other examples, the context menu 401 may also include other selectable options or information, such as a description of the new classifier 140, a number of documents associated with classes of the new classifier 140, or an indication of how many more documents should be classified manually before a document classifier is generated.

FIG. 5 represents the GUI 130 with the file system tab 202 selected. The file system tab 202 includes selectable options associated with navigating the file system. For example, in FIG. 5, the file system tab 202 includes a tool bar that includes selectable options 501-503. The tool bar includes a change drives selectable option 501 to enable selection of a different drive, a different logical partition, a different physical storage location, or a different root folder. The tool bar may also include a change folders selectable option 502 to enable opening a different folder. For example, in FIG. 5, the folder icon 135 is open indicating that the documents Doc 1, Doc 2, and Doc 3 are stored in a location associated with the folder icon 135. The change folders selectable option 502 may be selected to close the folder icon 135 and open the folder icon 134, resulting in display of document icons representing documents stored in a location associated with the folder icon 134. The tool bar also includes a search selectable option 503. The search selectable option 503 enables a user to search for a particular drive, folder, or document within the file system.

FIG. 6 represents the GUI 130 with the builder tab 203 selected. The builder tab 203 includes selectable options associated with generating a document classifier. For example, in FIG. 6, the builder tab 203 includes a tool bar that includes a build classifier selectable option 601 and a settings selectable option 602. The build classifier selectable option 601 is selectable to initiate generation of a document classifier. The settings selectable option 602 is selectable to enable the user to specify the classifier generation settings 123. For example, selecting the settings selectable option 602 may cause a menu (not shown) to be displayed. The menu may include options to specify setting associated with whether the preliminary document classifiers 122 should include particular types of document classifiers, and settings associated with each particular type of document classifier. For example, for decision tree-based document classifiers, the settings may enable specifying a splitting strategy (e.g., strategy to use to split at each node), a splitting criterion (e.g., a function to measure quality of a split), a threshold (e.g., maximum or minimum) number of features, a threshold (e.g., maximum or minimum) depth, a weighting criterion (e.g., a threshold number of samples to produce a split or a threshold number of samples to be a leaf node), class weights, and so forth. As another example, for SVM-based document classifiers, the settings may enable specifying a kernel function type (e.g., linear or non-linear), a number of classes, and so forth. As another example, for regression-based document classifiers, the settings may enable specifying a bias value or bias function, a number of classes, a class weight, a penalty, etc. As still another example, for perceptron-based document classifiers, the settings may enable specifying a regularization, an alpha value, a number of iterations, an eta value, a number of classes, class weights, etc. As a further example, for naive Bayesian-based document classifiers, the settings may enable specifying a number of classes, a smoothing parameter, a prior value or function (e.g., uniform priors), etc.

In some implementations, the settings may also enable a user to specify how and when a document classifier is generated. For example, the settings may include an option to specify a rebuild criterion indicating a condition or conditions for initiating generation of an updated document classifier, such as a time period following generation of the active document classifier 110, a threshold number of automatically classified documents that are reclassified by a user, a change in the classes (e.g., addition of classes or deletion of classes by a user), etc.

In yet another example, the settings may include an option to specify how the docvecs are formed. To illustrate, the option to specify how the docvecs are formed may allow the user to select use of docvecs based on a sum of wordvecs or based on a weighted sum of wordvecs. The setting may also include an option to specify how the wordvecs are generated. To illustrate, the user may specify a source of the wordvecs in the settings (e.g., a commercial or academic source of wordvecs), or the user may specify that the wordvecs are to be generated based on the files 109 using a skip-gram or CBOW process.

FIG. 7 illustrates a process for generating a document classifier based on user input. The process illustrated in FIG. 7 may be performed by the computing device 102, such as by the processor 103 executing the classifier generation instructions 106.

In FIG. 7, the classification data 117 includes file identifiers 701 and corresponding classification tags 705. For example, the classification data 117 includes a first pointer 702 indicating a storage location of a first document and a first tag 706 indicating a classification assigned to the first document. The classification data 117 also includes a second pointer 703 indicating a storage location of a second document and a second tag 707 indicating a classification assigned to the second document. The classification data 117 may also include one or more additional pointers, such as an Mth pointer 704 indicating a storage location of an Mth document and one or more additional tags, such as an Mth tag 708 indicating a classification assigned to the Mth document. The classification data 117 may be stored in a memory, such as the memory 104, based on user input provided via a GUI, such as the GUI 130 of FIGS. 1-6.

The pointers 702-704 are used to access the documents from a data store. For example, a particular file 720 (e.g., the first file) may be accessed from a storage location indicated by a pointer (e.g., the first pointer 702) to the particular file 720 in the classification data 117. The particular file 720 may be analyzed by the word list instructions 114 to determine a word list 721 of the particular file 720. The word list 721 of the particular file 720 indicates words that appear in the particular file 720. The word list 721 may also indicate a count or frequency of occurrence of each word in the particular file 720.

The word list 721 of the particular file 720 is provided to the wordvec instructions 115. The wordvec instructions 115 access wordvecs 710 in a memory (e.g., the memory 104) and generate a set of wordvecs 722 corresponding to the words in the word list 721. For example, if the word list 721 includes the words “a,” “be,” and “sea,” the wordvec instructions 115 select a wordvec for the word “a,” a wordvec for the word “be,” and a wordvec for the word “sea” for inclusion in the set of wordvecs 722 for the particular file 720.

The docvec instructions 116 use the set of wordvecs 722 for the particular file 720 to generate a docvec 724 for the particular file 720. For example, the docvec instructions 116 may mathematically aggregate the wordvecs of the set of wordvecs 722 to generate the docvec 724. A particular example of a method of generating a docvec is described with reference to FIG. 8.

The docvec 724 and file classification data 725 for the particular file 720 are provided as supervised training data 726 to the machine learning instructions 121. In FIG. 7, the machine learning instructions 121 include classifier generation instructions 730 and classifier testing instructions 732. The classifier generation instructions 730 use a first portion of the supervised training data 726 to generate multiple preliminary document classifiers 122. For example, the classifier generation instructions 730 may, based on the classifier generations settings 123, generate one or more neural network document classifiers, one or more decision tree classifiers, one or more support vector machine classifiers, one or more regression document classifiers, one or more naive Bayes document classifiers, one or more perceptron document classifiers, etc.

The classifier testing instructions 732 use a second portion of the supervised training data 726 to test performance of each of the preliminary document classifiers 122. For example, the classifier testing instructions 732 determine a performance metric or multiple performance metrics for each of the preliminary document classifiers 122 and provide a performance indicator 733 or performance indicators to the classifier generations instructions 730. The performance indicator 733 or performance indicators may indicate values of the performance metrics. Additionally or in the alternative, the performance indicator 733 or performance indicators may identify the best performing preliminary document classifier of the preliminary document classifiers 122. The best performing document classifier may be selected based on classification accuracy, processing time, complexity, or other factors.

Based on the performance indicator 733 or the performance indicators, the classifier generation instructions 730 generate the active document classifier 110. In a particular implementation, the classifier generation instructions 730 generate the active document classifier 110 by designating the best performing preliminary document classifier as the active document classifier 110. In another particular implementation, the classifier generations instructions 730 use a portion of the classifier generation settings 123 associated with the best performing preliminary document classifier and the supervised training data 726 to generate a new classifier, which is designated the active document classifier 110. In this implementation, the preliminary document classifiers 122 are used to identify which type of document classifier and which classifier generations settings work best for a particular document corpus by dividing the supervised training data 726 into a training portion and a test portion. After identifying classifier parameters (e.g., a type of document classifier and classifier generation settings) that work best for the particular document corpus, the classifier generation instructions 730 generate the active document classifier 110 using the classifier parameters and the entire set of supervised training data 726. Thus, the active document classifier 110 may be trained using a larger set of supervised training data, which is expected to improve the accuracy of classifications assigned by the active document classifier 110. The active document classifier 110 is stored in the memory 104 for use in classifying documents that were not manually classified to generate the classification data 117.

FIG. 8 illustrates details of particular aspects of the process for generating a document classifier based on user input of FIG. 7. In particular, FIG. 8 illustrates an example of generating the set of wordvecs 722 for a particular file 720 and several examples of generating a docvec based on the set of wordvecs 722.

In FIG. 8, a memory includes wordvecs 710 for a document corpus. The document corpus used to generate the wordvecs 710 may be independent of the documents that are to be classified by the document classifier. For example, the wordvecs 710 may be generated based on a selection of publicly available documents in the same language as the documents to be classified. To illustrate, in some examples, the wordvecs 710 may be accessed from a commercial or academic source of natural language processing data.

The wordvec instructions 115 of FIGS. 1 and 7 may select particular wordvecs from the wordvecs 710 based on the word list 721 for the particular document. To illustrate, in FIG. 8, the word list 721 includes the words “a,” “and,” and “zip.” Accordingly, the wordvec instructions 115 generate the set of wordvecs 722 for the particular document by selecting, from the wordvecs 710, wordvecs corresponding to the words “a,” “and,” and “zip.”

The docvec instructions 116 of FIGS. 1 and 7 generate the docvec 724 by mathematically aggregating the wordvecs 722 for the particular document. FIG. 8 illustrated four examples 801-804 of mathematically aggregating the wordvecs 722 to generate the docvec 724. In a first example 801, the wordvecs 722 are added together. To illustrate, each wordvec includes a plurality of fields, and the wordvecs 722 are added field-by-field. Thus, in the first example 801, a first field of the wordvec corresponding to the word “a,” a first field of the wordvec corresponding to the word “and,” and a first field of the wordvec corresponding to the word “zip,” are added to generate a value of 178 for a first field of the docvec. Likewise, a second field of the wordvec corresponding to the word “a,” a second field of the wordvec corresponding to the word “and,” and a second field of the wordvec corresponding to the word “zip,” are added to generate a value of 88 for a second field of the docvec. The field-by-field addition continues to generate a value for each field of the docvec 724.

In a second example 802, the wordvecs 722 are averaged field-by-field. Thus, in the second example 802, a first field of the wordvec corresponding to the word “a,” a first field of the wordvec corresponding to the word “and,” and a first field of the wordvec corresponding to the word “zip,” are added to generate a sum, and the sum is divided by a number of wordvecs added (in this case 3) to generate a value of 59.33 for a first field of the docvec 724. The field-by-field averaging continues to generate a value for each field of the docvec 724.

The third example 803 and the fourth example 804 use weighted aggregation of the wordvecs 722. To illustrate, in the third example 803, the docvec 724 corresponds to a field-by-field weighted sum of the wordvecs 722, and in the fourth example 804, the docvec 724 corresponds to a field-by-field weighted average of the wordvecs 722. Weighting values for the third example 803 and the fourth example 804 are determined based on an indicator of specificity of each word in the set of documents to be classified. For example, the weighting values may include an inverse document frequency value for each word. In other examples, other measures of specificity of each word may be used as weighting values.

FIG. 9 is a flowchart illustrating a particular example of a method 900 of generating a document classifier based on user input. The method 900 may be performed by a computing device, such as the computing device 102 of FIG. 1 executing the classifier generation instructions 106.

The method 900 includes, at 901, receiving, via a graphical user interface (GUI) including a plurality of document elements and a plurality of class elements (e.g., folder icons), user input associating a first document element of the plurality of document elements with a first class element of the plurality of class elements. Each document element of the GUI represents a corresponding document of a plurality of documents and each class element of the GUI represents a corresponding class of a plurality of classes. For example, in FIG. 1, the GUI 130 includes a plurality of document elements (e.g., the document icons 136-138) representing a plurality of documents (e.g., documents Doc 1, Doc 2, and Doc 3), and the GUI 130 includes a plurality of class elements (e.g., the folder icons 141-144) representing classes (e.g., the classes Class 1, Class 2, Class 2.1, and Class 2.2). In this example, the GUI 130 is configured to receive user input, such as a drag-and-drop operation, to move a document icon to a folder icon. Moving the document icon to the folder icon indicates assignment of a document represented by the document icon to a class represented by the folder icon.

The method 900 includes, at 902, generating a document classifier using supervised training data, the supervised training data indicating, based on the user input, that a first document represented by the first document element is assigned to a first class associated with the first class element. For example, in FIG. 1, the classifier generation instructions 106 include the feature extraction instructions 113, which are configured to generate supervised training data including a docvec and a classification (e.g., a tag) for each document. The machine learning instructions 121 of FIG. 1 are configured to generate one or more document classifiers based on the supervised training data.

FIG. 10 is a flowchart illustrating another particular example of a method 1000 of generating a document classifier based on user input. The method 1000 may be performed by a computing device, such as the computing device 102 of FIG. 1 executing the classifier generation instructions 106.

The method 1000 includes, at 1001, receiving user input defining a plurality of classes. For example, the user input may include a selection to create a new folder and information designating a name of the new folder, where the name of the new folder corresponds to an identifier of a new class of the plurality of classes. In some implementations, the user input may be received via a graphical user interface (GUI), such as the GUI 130 which includes a plurality of folder icons 141-144 representing user-defined classes. The classes may be generated using file system like operations, as described with reference to FIGS. 2-4.

The method 1000 includes, at 1002, receiving, via a GUI including a plurality of document elements and a plurality of class elements (e.g., folder icons), user input associating a first document element of the plurality of document elements with a first class element of the plurality of class elements. The GUI is based on the user input defining the plurality of classes. Each document element of the GUI represents a corresponding document of a plurality of documents and each class element of the GUI represents a corresponding class of a plurality of classes. For example, in FIG. 1, the GUI 130 includes a plurality of document elements (e.g., the document icons 136-138) representing a plurality of documents (e.g., documents Doc 1, Doc 2, and Doc 3), and the GUI 130 includes a plurality of class elements (e.g., the folder icons 141-144) representing classes (e.g., the classes Class 1, Class 2, Class 2.1, and Class 2.2). In this example, the GUI 130 is configured to receive user input, such as a drag-and-drop operation, to move a document icon to a folder icon. Moving the document icon to the folder icon indicates assignment of a document represented by the document icon to a class represented by the folder icon.

The method 1000 includes, at 1003, generating a pointer and a tag, where the pointer indicates a storage location of the first document in a file system and the tag identifies the first class. For example, in FIG. 1, the classification data 117 includes entries 118-120, each of which includes a pointer to a respective document, and a tag indicating a class to which the respective document is assigned.

The method 1000 includes, at 1004, generating a first document vector based on the first document. For example, in FIG. 1, the feature extraction instructions 113 are executable to generate document vectors based on the classification data 117. FIGS. 7 and 8 describe generation of a document vector in more detail.

The method 1000 includes, at 1005, generating multiple preliminary document classifiers based on a first portion of supervised training data (indicating that a first document represented by the first document element is assigned to a first class associated with the first class element). Each preliminary document classifier of the multiple preliminary document classifiers is generated based on respective classifier generation settings. For example, the multiple preliminary document classifiers may correspond to the preliminary document classifiers 122 of FIG. 1 and FIG. 7. In this example, each of the preliminary document classifiers 122 is generated based on a training portion of the supervised training data 726 of FIG. 7, and based on a portion of the classifier generation settings 123. To illustrate, a first preliminary document classifier of the multiple preliminary document classifiers 122 may be a first type of document classifier generated using a first machine learning process and using a first subset of the classifier generation settings 123 related to the first machine learning process. A second preliminary document classifier of the multiple preliminary document classifiers 122 may be a second type of document classifier generated using a second machine learning process and using a second subset of the classifier generation settings 123 related to the second machine learning process. The supervised training data includes the document vector generated based on the first document and a user assigned class associated with the first document.

The method 1000 includes, at 1006, evaluating performance of the multiple preliminary document classifiers based on a second portion of the supervised training data. For example, the classifier testing instructions 732 of FIG. 7 may provide input docvecs based on a test portion of the supervised training data 726 to each of the multiple preliminary document classifiers 122. Each preliminary document classifier may generate a classification result based on each of the input docvecs. The classifier test instructions 732 may compare each classification result to the user assigned file classification (e.g., the file classification data 725) associated with a corresponding docvec. A performance metric may be determined for each of the preliminary document classifiers 122. The performance metric may indicate, for example, how accurately the classification results generated by each preliminary document classifier matched the user assigned file classifications. The performance metric may also indicate processing time, complexity, or other characteristics of each of the preliminary document classifiers 122. A best performing preliminary document classifier may be selected based on the performance metric(s).

The method 1000 includes, at 1007, generating a document classifier (e.g., the active document classifier of FIGS. 1 and 7) using the supervised training data and classifier generation settings of the best performing preliminary document classifier. For example, the classifier generation instruction 730 may generate the active document classifier 110 using classifier generations settings associated with the best performing preliminary document classifier and using the supervised training data 726. Thus, the active document classifier 110 may be of the same type and use the same classifier parameters as the best performing preliminary document classifier; however, the active document classifier may be trained using a larger subset of or the entirety of the supervised training data 726. As a result of the larger training data set of the active document classifier 110 (as compared to the training data portion used to generate the best performing preliminary document classifier), the active document classifier 110 should generate more accurate classification results than the best performing preliminary document classifier. Thus, the classifier generation instructions 106 enable a user who is not a data scientist to generate a reliable document classifier. Because the user is not a trained data scientist, the user may not have the expertise to select the best type of document classifier for a particular document corpus. Generating multiple different types of preliminary document classifiers using different classifier generation settings and testing the performance of each preliminary document classifier enables selection of a best performing type of document classifier and corresponding parameters without relying on a data scientist.

The method 1000 includes, at 1008, detecting that a rebuild condition is satisfied after generating the document classifier (e.g., after designating the active document classifier). For example, after the active document classifier 110 has been in use for a period of time, a rebuild condition may be satisfied. The rebuild condition being satisfied may indicate that reliability of the active document classifier 110 is suspect. For example, the rebuild condition may be satisfied when a threshold number of document classified by the active document classifier 110 have been manually reclassified. As another example, the rebuild condition may be satisfied when a significant change (e.g., greater than a threshold) is detected in the distribution of classifications made by the active document classifier 110. The rebuild condition may be specified in settings associated with the machine learning instructions 121, such as via the settings selectable option 602 of FIG. 6,

The method 1000 includes, at 1009, generating an updated document classifier based on detecting that the rebuild condition is satisfied. For example, the classifier generation instructions 106 of FIG. 1 may automatically execute to generate an updated document classifier based on detecting that the rebuild condition is satisfied. In another example, the classifier generation instructions 106 of FIG. 1 may prompt a user to initiate generation of the updated document classifier based on detecting that the rebuild condition is satisfied. The updated document classifier may be generated based on supervised training data based at least in part on manual document classifications received via the GUI 130 after the active document classifier 110 was generated.

When an updated document classifier is generated, the updated document classifier is generated based on second supervised training data. The second supervised training data may be distinct from the supervised training data used to generate the active document classifier. For example, the supervised training data used to generate the active document classifier may include first data indicating that each document of a first set of documents is assigned to one or more classes of a first set of classes, and the second supervised training data may include second data indicating that each document of a second set of documents is assigned to one or more classes of a second set of classes, where the first set of classes is different from the second set of classes. As another example, the supervised training data used to generate the active document classifier may include first data indicating that each document of a first set of documents is assigned to one or more classes of a first set of classes, and the second supervised training data may include second data indicating that each document of a second set of documents is assigned to one or more classes of a second set of classes, where the first set of documents is different from the second set of documents. As yet another example, the supervised training data used to generate the active document classifier may include first data indicating that each document of a first set of documents is assigned to one or more classes according to a first hierarchical arrangement, and the second supervised training data may include second data indicating that each document of a second set of documents is assigned to one or more classes according to a second hierarchical arrangement, where the first hierarchical arrangement is different from the second hierarchical arrangement.

The systems and methods illustrated herein may be described in terms of functional block components, screen shots, optional selections and various processing steps. It should be appreciated that such functional blocks may be realized by any number of hardware and/or software components configured to perform the specified functions. For example, a system may employ various integrated circuit components, e.g., memory elements, processing elements, logic elements, look-up tables, and the like, which may carry out a variety of functions under the control of one or more microprocessors or other control devices. Similarly, the software elements of the system may be implemented with any programming or scripting language such as C, C++, C#, Java, JavaScript, VBScript, Macromedia Cold Fusion, COBOL, Microsoft Active Server Pages, assembly, PERL, PHP, AWK, Python, Visual Basic, SQL Stored Procedures, PL/SQL, any UNIX shell script, and extensible markup language (XML) with the various algorithms being implemented with any combination of data structures, objects, processes, routines or other programming elements. Further, it should be noted that the system may employ any number of techniques for data transmission, signaling, data processing, network control, and the like.

The systems and methods of the present disclosure may be embodied as a customization of an existing system, an add-on product, a processing apparatus executing upgraded software, a standalone system, a distributed system, a method, a data processing system, a device for data processing, and/or a computer program product. Accordingly, any portion of the system or a module may take the form of a processing apparatus executing code, an internet based (e.g., cloud computing) embodiment, an entirely hardware embodiment, or an embodiment combining aspects of the internet, software and hardware. Furthermore, the system may take the form of a computer program product on a computer-readable storage medium or device having computer-readable program code (e.g., instructions) embodied or stored in the storage medium or device. Any suitable computer-readable storage medium or device may be utilized, including hard disks, CD-ROM, optical storage devices, magnetic storage devices, and/or other storage media. A computer-readable storage medium or device is not a signal.

Systems and methods may be described herein with reference to screen shots, block diagrams and flowchart illustrations of methods, apparatuses (e.g., systems), and computer media according to various aspects. It will be understood that each functional block of a block diagrams and flowchart illustration, and combinations of functional blocks in block diagrams and flowchart illustrations, respectively, can be implemented by computer program instructions.

Computer program instructions may be loaded onto a computer or other programmable data processing apparatus to produce a machine, such that the instructions that execute on the computer or other programmable data processing apparatus create means for implementing the functions specified in the flowchart block or blocks. These computer program instructions may also be stored in a computer-readable memory or device that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart block or blocks. The computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer-implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart block or blocks.

Accordingly, functional blocks of the block diagrams and flowchart illustrations support combinations of means for performing the specified functions, combinations of steps for performing the specified functions, and program instruction means for performing the specified functions. It will also be understood that each functional block of the block diagrams and flowchart illustrations, and combinations of functional blocks in the block diagrams and flowchart illustrations, can be implemented by either special purpose hardware-based computer systems which perform the specified functions or steps, or suitable combinations of special purpose hardware and computer instructions.

Methods disclose herein may be embodied as computer program instructions on a tangible computer-readable medium, such as a magnetic or optical memory or a magnetic or optical disk/disc. All structural, chemical, and functional equivalents to the elements of the above-described exemplary embodiments that are known to those of ordinary skill in the art are expressly incorporated herein by reference and are intended to be encompassed by the present claims. Moreover, it is not necessary for a device or method to address each and every problem sought to be solved by the present disclosure, for it to be encompassed by the present claims. Furthermore, no element, component, or method step in the present disclosure is intended to be dedicated to the public regardless of whether the element, component, or method step is explicitly recited in the claims. As used herein, the terms “comprises”, “comprising”, or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.

Changes and modifications may be made to the disclosed embodiments without departing from the scope of the present disclosure. These and other changes or modifications are intended to be included within the scope of the present disclosure, as expressed in the following claims. 

What is claimed is:
 1. A method comprising: receiving, via a graphical user interface including a plurality of document elements and a plurality of class elements, user input associating a first document element of the plurality of document elements with a first class element of the plurality of class elements, wherein each document element represents a corresponding document of a plurality of documents and each class element represents a corresponding class of a plurality of classes; updating, based on the user input, supervised training data to indicate that a first document represented by the first document element is assigned to a first class associated with the first class element; receiving, via the graphical user interface, a selection of a particular option; and based on receiving the selection of the particular option: generating multiple preliminary document classifiers based on a first portion of the supervised training data, each preliminary document classifier of the multiple preliminary document classifiers generated based on respective classifier generation settings; evaluating performance of the multiple preliminary document classifiers based on a second portion of the supervised training data; and generating a document classifier based on classifier generation settings of a best performing preliminary document classifier of the multiple preliminary document classifier.
 2. The method of claim 1, further comprising, before receiving the user input, receiving second user input defining the plurality of classes, wherein the graphical user interface is generated based on the second user input.
 3. The method of claim 2, wherein receiving the second user input includes receiving a selection to create a new folder and receiving information designating a name of the folder, wherein the name of the folder is associated with an identifier of a new class of the plurality of classes.
 4. The method of claim 3, further comprising receiving a selection to rename the folder and receiving information designating a new name of the folder, wherein the new name of the folder is associated with the identifier of the class.
 5. The method of claim 1, further comprising, responsive to the user input, generating a pointer and a tag, the pointer indicating a storage location of the first document in a file system and the tag identifying the first class.
 6. The method of claim 1, wherein a first preliminary document classifier of the multiple preliminary document classifiers is generated using a first machine learning process and a second preliminary document classifier of the multiple preliminary document classifiers is generated using a second machine learning process, wherein the first machine learning process is different from the second machine learning process.
 7. The method of claim 1, further comprising: after generating the document classifier, detecting that a rebuild condition is satisfied; and based on detecting that the rebuild condition is satisfied, generating an updated document classifier.
 8. The method of claim 7, wherein the document classifier is generated based on the supervised training data, wherein the updated document classifier is generated based on second supervised training data, wherein the supervised training data includes first data indicating that each document of a first set of documents is assigned to one or more classes of a first set of classes, wherein the second supervised training data includes second data indicating that each document of a second set of documents is assigned to one or more classes of a second set of classes, and wherein the first set of classes is different from the second set of classes.
 9. The method of claim 7, wherein the document classifier is generated based on the supervised training data, wherein the updated document classifier is generated based on second supervised training data, wherein the supervised training data includes first data indicating that each document of a first set of documents is assigned to one or more classes of a first set of classes, wherein the second supervised training data includes second data indicating that each document of a second set of documents is assigned to one or more classes of a second set of classes, and wherein the first set of documents is different from the second set of documents.
 10. The method of claim 7, wherein the document classifier is generated based on the supervised training data, wherein the updated document classifier is generated based on second supervised training data, wherein the supervised training data includes first data indicating that each document of a first set of documents is assigned to one or more classes according to a first hierarchical arrangement, wherein the second supervised training data includes second data indicating that each document of a second set of documents is assigned to one or more classes according to a second hierarchical arrangement, and wherein the first hierarchical arrangement is different from the second hierarchical arrangement.
 11. A computing device comprising: a memory storing document classifier generation instructions; and a processor configured to execute instructions from the memory, wherein the document classifier generation instructions are executable by the processor to perform operations comprising: receiving, via a graphical user interface including a plurality of document elements and a plurality of class elements, user input associating a first document element of the plurality of document elements with a first class element of the plurality of class elements, wherein each document element represents a corresponding document of a plurality of documents and each class element represents a corresponding class of a plurality of classes; updating, based on the user input, supervised training data to indicate that a first document represented by the first document element is assigned to a first class associated with the first class element; receiving, via the graphical user interface, a selection of a particular option; and based on receiving the selection of the particular option: generating multiple preliminary document classifiers based on a first portion of the supervised training data, each preliminary document classifier of the multiple preliminary document classifiers generated based on respective classifier generation settings; evaluating performance of the multiple preliminary document classifiers based on a second portion of the supervised training data; and generating a document classifier based on classifier generation settings of a best performing preliminary document classifier of the multiple preliminary document classifiers, the supervised training data used to generate the document classifier.
 12. The computing device of claim 11, wherein the user input associating the first document element with the first class element includes at least one of a drag-and-drop operation, a copy-and-paste operation, or a cut-and-paste operation.
 13. The computing device of claim 11, wherein the memory further stores file system data associated with the plurality of documents, and wherein the user input associating the first document element with the first class element does not change a portion of the file system data associated with the first document.
 14. A computer readable storage device storing instructions that are executable by a processor to perform operations comprising: receiving, via a graphical user interface including a plurality of document elements and a plurality of class elements, user input associating a first document element of the plurality of document elements with a first class element of the plurality of class elements, wherein each document element represents a corresponding document of a plurality of documents and each class element represents a corresponding class of a plurality of classes; updating, based on the user input, supervised training data to indicate that a first document represented by the first document element is assigned to a first class associated with the first class element; receiving a selection of a particular option; and based on receiving the selection of the particular option: generating multiple preliminary document classifiers based on a first portion of the supervised training data, each preliminary document classifier of the multiple preliminary document classifiers generated based on respective classifier generation settings; evaluating performance of the multiple preliminary document classifiers based on a second portion of the supervised training data; and generating a document classifier based on classifier generation settings of a best performing preliminary document classifier of the multiple preliminary document classifiers, the document classifier generated using the supervised training data.
 15. The computer readable storage device of claim 14, wherein the operations further comprise generating a first document vector based on the first document, wherein the supervised training data includes the first document vector and classification data indicating that the first document is assigned to the first class, and wherein the selection of the particular option is received via the graphical user interface.
 16. The computer readable storage device of claim 15, wherein the first document includes a first plurality of words, and wherein the first document vector is generated based on a plurality of word vectors corresponding to the first plurality of words.
 17. The computer readable storage device of claim 16, wherein the operations further comprise generating one or more word vectors of the plurality of word vectors based on the plurality of documents.
 18. The computer readable storage device of claim 16, wherein one or more word vectors of the plurality of word vectors is generated independently of the plurality of documents.
 19. The computer readable storage device of claim 15, wherein the first document includes a first plurality of words, and wherein the first document vector is generated by: retrieving a first word vector for a first word of the first document; retrieving a second word vector for a second word of the first document; and combining at least the first word vector and the second word vector to generate the first document vector.
 20. The computer readable storage device of claim 15, wherein the first document vector is generated using a field-by-field mathematical operations on word vectors of words of the first document.
 21. The computer readable storage device of claim 15, wherein the first document vector is generated as a weighted field-by-field sum of word vectors of words of the first document, wherein the weighted field-by-field sum uses a weighting value for each word vector, and wherein the weighting value of a particular word vector is determined based on an inverse document frequency, in the plurality of documents, of a particular word corresponding to the particular word vector. 